Metal-working machine.



Y E. C. HENN.

METAL WORKING MACHINE.

APPLIGATION FILED SEPT. so, 1910.

Patented Oct. 17, 1911.

4 SHEETS-SHEET 1.

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E. C. HENN.

METAL WORKING MACHINE.

APPLIOATION FILED SEPT. so, 1910.

Patented 001.121.911.

4 SHEETS-SHEET 2.

gwn@ nloz 'dwzzz @Hevia @$357113 Hozne l E. C. HENN.

METAL WORKING MACHINE.

APPLICATION FILED SEPT. so. 1910.

Patented Oct. 17, 1911.

4 SHEETS-SHEET 3.

llllll E. C. HENN.

METAL WORKING MACHINE.

APPLICATION FILED snm. so, 1910.

1,005,833. 1 Patented 001. 17, 1911.

' 4 SHBBTS-SHEET 4. 112g. 6.

wi/m0510210 UNITED sTATEs PATENT OFFICE.

EDWIN-C. HENN, OF CLEVELAND. OHIO, ASSIGNOR T0 THE NATTONAL-ACME-MAN'UFAC- TUBING COMPANY, 0F CLEVELAND, OHIO, A CORPORATION 0F '0H-I0.

METAL-WORKING MACHINE.

aoeafese.

Specication of Letters atent.

yIatellted 0017. 1&7, 1911.

To all whom it may concern: .t

Be it known that I, EDWIN C. HENN, a; citizen of the United States, residing at, Cleveland, in the county of Cuyahoga and Sta-te of Ohio, have invented certain new-` and useful Improvements in Metal-l/Vorking f, Machines, of which the following is a spe'cification.

This invention relates to \-metal working machines, more particularly to that class; thereof known as automatic multiple spindle screw machines, the object of the inven-1 tion being to provide an improved ma chine of this character by means of which the successive threading of thef rod spindles may be accomplished much more quickly than heretofore by reason of;

the fact-that the work or rod spindle is,y during the threading of the rod by the threading die, held stationary, while thel backing olf of the die is obtained without-A the necessity of starting up or rotating the work spindle or reversing the threading die.

A further object of the invention is the provision of an improved metal working machine in which the work spindle and its threaded rod may be quickly released from the threading die and rotated immediately after the thread has been cut, without the necessity of Waiting, as heretofore, until the cutting or threading die has been backed off, thus materially increasing the output of the machine while accomplishing this procedure in a very simple and effective manner.

A further object of the invention is the provision of an improved machine in which the threading die does not need to be stopped, and therefore may be continuously rotated in the same direction both during the threading ofthe work and the backing olf of the die therefrom, kwhile the direction of rotation of the work or rod likewise does not need to be reversed.

In the drawings accompanying and forming part of this specification, Figure 1 is a perspective view of an automatic multiple spindle screw machine embodying the present improvement; Fig. 2 is an end view of the machine with parts thereof in section and broken away, looking from right to left in Fig. 1 Fig. 3 is a side elevation of the work spindle end of the machine shown in Fig. 2; Figs. 4 and 5 are partly longitudinal sectional views illustrating the threading die in different positions; Fig. 6 illustrates a modification of the threading die opening means shown in Figs. 1 to 5; Fig. '7 is a detail view more particularly illustrating the threading die and the means for operating it; Fig. 8 lis a detail View, Ipartly in section, of the threading die and its spindle; Fig. 9 is an end elevation, with parts thereof broken away, of the threading die; Fig.` 10 is a cross sectional vieur ofthe threading die; and Figs. 11 and 12 are respectively a sectional and a perspective view o'f a form of clutch for holding the work spindle stationary during the threadinr operation.

Similar characters of reference indicate corresponding parts throughout the figures of the drawings.

In the preferred form thereof herein shown, the several partsof the machine are mounted upon a suitable bed ZLtarrying a cam shaft 3 on 'which are mounted cam drums 4 and 5, one ofwhich, as 4, controls the sliding' movement of the sliding tool, head or carrier 6 carrying a series of tools, each mounted in a spindle. Supported upon the bed is a turret casing 7 carrying a revoluble work 'turret 8, which is rotated in some suitable manner through the medium of the cam shaft 3. This revoluble turret carries a series of work or rod spindles 9,

which spindles are rotatable by suitable mechanism. Only a general description of these parts is deemed necessary, since they are well known.

For the purpose of threading each' rod successively as it is brought into position opposite the threading die hereinafter described, an improved threading mechanism is provided, the threading operation being carried on on a stopped or stationary work spindle, and for the purpose of stopping and holding the spindle stationary during thisr threading operation some suitable form of mechanism is provided. This may include a clutch mechanism either friction held for stopping the spindle or ositively locked means. In the present improvement the mechanism shown for that purpose, and for operating it, is similar in part to that shown and described in the application of Oscar A. Smith, Serial No. 571,955, filed July 14, 1910, and therefore only a general description thereof is deemed necessary herein.

l This mechanism is located in position to cooperate with each rod .spindle as it is successively carried into position to have the work carried thereby operated upon by a threading die, for the purpose of stopping the rotation of the spindle, which is normally rotating,- during the threading operation and to permit the continued rotation of the work spindle after such threading is completed. Each rod spindle, four being shown herein, is provided with a suitable friction clutch mechanism 10, see Figs. 11 and 12. Each of these clutch mechanisms comprises a cone clutch 12 loosely mounted on the spindle shaft 12 and carrying a gear 10 which is continuously rotated by the usual gear provided for that purpose. Cooperatlng with the coned end of this clutch member 12 is a clutch sleeve 11 maintained in frictional engagement with the member 12 of the clutch by means of spiral springs 9. One end of each spring is in engagement with the shiftable clutch member 11 while the opposite 'end of the spring engages a collar 13 slidable on the spindle shaft and shifts it toward and from a fixed collar 14 Xedly secured to the shaft, whereby when the clutch sleeve 11 is shifted away from the clutch member 12 the springs 9 will force the collar 13 into engagement with the hcollar 14 and thus, by this frictional engagement, hold the spindle shaft against rotation. The clutch member 11 is keyed to a sleeve 11, which is fast to the spindle shaft 12, whereby when the clutch members 11 and 12 are in engagement the rotation of the clutch member 12 by means of the gear 10 will rotate the spindle shaft.

The friction engaging means just described may be used for holding the spindle shaft stationary for some forms of work, as for instance light work. For heavier work, however, it is desirable to have a positively acting means for preventing the rotation of the spindle shaft, and thereby the work, during the threading operation, and for this purpose the bracket 15 hereinafter described is provided with a spring actuated pin 50 adapted to engage projections 51 carried byl the clutch member 11, the spring 52- being useful to permit the pin to be moved out of the way temporarily should the ends of the project-ions 51 contact therewith when the clutch member 11 is shifted. It will be observed that when the clutch member .11 is from the pin 50, and consequently the spindle shaft will be then rotated.

For the purpose of separating the clutch 5 members 11 and 12 and holding them out of engagement, and for which purpose it is essential to compress the springs 9, friction clutch operating mechanism is provided. This comprises a bracket 15 rigidly secured to the turret casing 7 and carrying a shaft `16, on which is mounted a pair of levers 17 having projections or rolls 18 adapted to engage the shiftable member 11 of the clutch and shift it against the action of its springs away from its companion clutch member 12. Carried by this shaft 16, at one end thereof, is a bevel gear 19 in mesh with a crown gear 2O mounted on the up r end of a shaft 21, which shaft is suitab y supported in bearings carried by a bracket 22 mounted on the bed of the machine. Keyed to this shaft 21 is a crank lever 23 adapted to be shifted into different positions by suitable cam mechanism, thereby to partially rotate the crown gear and so rotate the bevel gear and shift the levers 17 into position either to separate the clutch members or to permit their engagement at the proper time.

The means for shift-ing the crank lever 23 comprises a cam slide actuated by the cam drum 5. A boss 'or bracket 24 is located at right angles to the turret 'casing 7 and is provided with a semi-circular opening into which is fitted to slide easy a semi-circular slide 27 having at its outer end a slotted or bifurcated head 2S. On this slide 27 is mounted a cam 29, this being fastened to the see 141g, 1, one wall of which, as 31, pro- Kf jects beyond the side face 32 of the cam.

In a crotch bearing 33 carried by the bed 2 is hung an actuating lever 34, the upper end of which lits into the slotted h ead of the slide 27, while the lower end 1s provided with a roll 35 for engagement with a pair of cams 36 and 37 secured to the cam drum 5 on the cam shaft 3, the cam 36 being effective to operate the ,lever in one direction while the cam 37 is effective to operate it in the opposite direction. By this improved mechanism that particular frietion clutch carried by the rod spindle with which the threading die is intended to cooperate may be opened or released until it is desired to close it again. In other words, as the work or rod spindles carri-ed by the revoluble work turret are successively brought 1into position to have the clutch members thereof adjacent to the levers or arms 17 of this clutch operating mechanism this mecha.- nism will be operated to release the clutch members and so prevent further .rotationv of the rod spindle, which is normally 'rothe rod while such work or rod spind of is stationary. In other words, when the cam drum 5, traveling in the direction of the arrow Fig. 2, carries the cam 36 into position to engage the roll 35 of the lever 34 it throws the upper end of this lever inwardly Ltoward the turret casing and so shifts the slide 27 and thereby the cam 29 into position to have the side face 32 of this cam engage and shift the crank lever 23 from one position to another, where it-is held against further movement, thereby shifting the shaft 21 and partially rotating the crown gear mounted thereon and conse uently rotattating, and thus permit the threading ing the bevel gear 19, which 1n turn shifts.

the'lever arms 17 mounted on the shaft 16 into position to engage the shiftable member 11 of the friction clutch mechanism and move it against the action of its springs out of engagement with its companion clutch member 12, thus revent-ing further rotation of the rod spindle, at which time the rod spindlewill be held stationary for the operation of the threading die by the friction collars 13 and 14 hereinbefore described, or by the positively acting pin and projections 50 and 51 hereinbefore described.

During the threading operation the cam 37 ofthe cam drum 5 1s shifted so that on the completion of such threading it will be in posit-ion to engage the roll 35 of the lever 34 and shift the lower end of this lever inwardly and the upper end thereof outwardly, thereby reversing the movement of the cam slide 29 and so carrying such slide away from its locking vposltion and into position to have the roJectin portion 31 thereof engage the friction rol 23 of the crank lever 23 and shift such lever with the slide, thereby reversing the crown gear and the bevel gear and thus carrying the arms 17 away from the clutch member 11 and into position where such arms will not interfere with the proper rotation of the turret and spindle, at which time the springs 9 will force the clutch member 11 into engagement -with the clutch member 12, whereupon the rod spindle will be again rotated in the manner hereinbefore described. In the present machine the turret casing is shown cut away, as at 60, to permit the proper shifting of the lever arms 17 out of the way in the manner indicated. v

One of the tools carried by the sliding tool carrier is a threading die 69 adapted to o erate successively on the rods carried by tlie work spindles of the revoluble turret as each is brou 'ht into position opposite this threading die, at which time the rotation of the work spindle is stopped by the clutch shifting means vhereinbefore described. As the threading die is shown anddescribed in my contemporaneously pending application, Serial No. 543,028', filed February 10, 1910, only a general description thereof is deemed necessary herein. The threading die comprises a die body 70 having four guides or ways 71 extending radially ofy the body, the rear portions of which ways are undercut, and in these guideways slide carriers 72 having extensions which slide in the undercut portions of the ways for retaining the carriers therein. Each of these slides has a projecting pin 73 which engages a coiled spring 74 placed in a bore 75 o the die body. These springs tend to shift the carriers outwardly from the axis of the body. In each of these carriers is secured a Chaser 76, which may be secured therein by a screw. 77. Suitable means is provided for causing the die carriers, and thereby the chasers, to simultaneously advance toward the center or axis of the die, thereby compressing the springs, such compressed springs at the proper time re-acting to shift the carriers outwardly from the axis of the body and thereby open the die. Each of the die carriers is shown provided with a tapered cam surface 78 on itsl outer portion. Coperating with each of these camsurfaces is a pin 79 secured in a suitable bore of the die head 80. This die head comprises a iiang'ed sleeve 81 having a groove 81 and a shell or cap 82, the latter inclosing the die body and chasers. The groove 81 formed by the sleeve 81 is adapted to receive a suitable operating devlce for opening and closing the die. The sprin s 74 act to press the die carriers outward y and thereby cause the engagement of the coperating camsurfaces formed by the tapered portions of the carriers and the cam pins. When the die head is moved: forward the pins 79 coperate with the tapered cam surfaces 78 and press the carriers simultaneously inward toward the center or axis of the die and thus into their closed position, see Fig. 10. When the head is shifted in the opposite direction, or rearwardly, the cam surfaces coperate to permit the s rings to press the carriers outwardly and t ereby open the die.

Adjustable means is provided for limiting the inward movement of the die chasers and their carriers, this consisting of a screw 85 working in a threaded bore of the die body, its inner end abutting against the shell 82 and limiting the closing movement'of the die body and head. The surfaces 78 of the carriers engaged by the cam pins 79 are made on a slight taper, whereby a very fine adjustment ofthe die chasers relative to the work can be obtained. Means is also provided for limiting the opening movement vof the head and die body, and this consists of a bolt 87 passin through a bore in the die body and seate in a threaded hole of the head, and by this means the separating movement of the head and die V:i see Fig. 8, and rotary movement is imparte thereto by a train of gears 89 from the work spindle driving shaft 90 of the machine.

For opening the die after the threading operation and thereby to permit the die to be backed off without interrupting the rotation thereof and without starting up the work spindle for this purpose, suitable means is provided. In one form thereof it comprises a forked lever 91 fitting into the groove of the die head 80 and fastened by means of a set screw 92 to a shiftable shafty or rod 93 supported in a horizontal bearing 93 of a bracket 94 secured to the tool slide and therefore movable therewith. For shifting this rod or shaft 93 a cam lever 95 is pivoted to the bed of the machine and carries on its lower end a stud and roll 96 coo erating with a tripping cam 98 secured to t e cam drum 4, which revolves in the direction indicated by the arrow Fig. 1. On the end of the shiftable shaft or rod 93 is secured a lever engaging stop or projection in the form of an adjustable collar 99, by means of a set screw.

In operation, when the lower end of the lever 95 is thrownto the right, the upper end thereof will engage the collar just described and thereby shift the shaft or rod and the forked lever carried thereby toward the left, thereupon carrying the die head into position to ermit the coperating cam surfaces of the die body and head to release the carriers and permit the springs to open the die chasers in the manner hereinbefore described.

In Fig.'` 6 a somewhat different form of die opening means is provided. In' this construction the lever 95 and its coperating parts are dispensed with. The collar 99 is moved along the shaft 93 so that the space between the collar and the'end of the horizontal bearing of the bracket 94 is equal to the 'length of the thread to be cut minus the lead of the cam. In this form of die opening means the die, during the cutting o eration, will carry the shaft93 forward aster than the travel of the bracket 94 with the tool slide, bringing the collar 99 into contact with the end of the horizontal bearing of the bracket 94, whereupon the travel of the shaft 93, and therefore the clutch lever and the die head will be retarded, thereby releasing the die chasers through the medium of the springs as hereinbefore explained.

After the die has been tripped and released or opened,which occurs as soon as the threading operation is completed, it isv backed of from the work so that as soon as the die is 4opened the work spindle can be immediately rotated and the turret indexed to-bring an- `other rod into position to be threaded, thus avoiding the necessity of waiting, as heretofore, a considerable period of time for the backing off of the die when this is accolnplished by rotating the work relatively to theV die or reversing the die. i

For closing the die after it has beenk tripped or released into position to thread another rod, the die spindle is provided with a grooved collar or spool 100 at its outer end. Coperatin with this grooved collar' `the adjustable stop 104 of the lever 101 int'o Contact with the stop 105, which causes the lever 101 to swingen its pivot, thereb accelerating the movement of the die spindle to the left in the same direction in which the tool slide and the die spindle are travelin This accelerated movement of the die splndle shifts the die body with relation to the die head or cap, which is prevented from accelerated movement during the .receding movement of the tool slide by reason ofthe fact that the forked lever in engagement with the groove of such die head and carried by the shaft 93 comes into contact at this time with the forward end of the horizontal bearing of the bracket 94 and thus prevents the sleeve or die head from further movement, so that, owing to the accelerated movement of the die body, this body is drawn back into the cap or shell of the head, whereupon the cam pins ride .up the tapered surfaces of the die carriers andso close the chasers and thus set the die for the next threadin operation in a manner which will be rea ily understood.

Carried by the die spindle, between a collar 107 thereof andthe grooved collar or spool 100, is a. spiral s ring 108, the purpose of which is to quicky pull back the die spindle as soon \as the threading operatlon 1s 'completed and the die is opened. When the toolslide is moving toward the work spmdles and the threadm die has commenced to thread one of the ro s this die travels on to the work faster than the tool slide moves; consequently the spring 108 is compressed, so that when the threadmg operation is completed and the die is opened this spring be- .thereby the threading die from t e rod and spring, however, is not of suiicient force to close the diein readiness for another threading operation, and therefore the means herein e fore described for this purpose, comprising the lever 101 and its cooperating parts, is provided.

From the foregoing it will be observed that by means of the present improvement each rod is successively brought into position to be threaded, atwhich time the rotation thereof is stopped by the friction clutch operating means, whereupon the rod is threaded by the threading die, which is continuously rotated in the same direction, and on the completion of such threadin the die immediately opened and backe ofi", Without the necessity of reversing the die or of starting up the work spindle for this purpose, thus very materially saving time, as it enables the work spindle to be immediately rotated through the operation of the friction clutch mechanism 'hereinbefore described and the turret quickly indexed to bring other i in the 1lpresent machine the necessity of back-- ing o the die by reversing it, or rotating the work spindle, is avoided,-consequently saving the time required for this operation.

I claim as my invention:

1. In an automatic multiple spindle screw machine, the combination of a rotary turret carrying a series of rotary work carrying spindles, means for revolving said turret intermittently, means for rotating the work carrying spindles, means for holding each of the work carrying spindles stationary at a predetermined time in the revolution of the turret and during the threading operation, a sliding tool carrier, a threading die carried thereby," means for rotating said threading die continuously in the same direction, and means for closing and opening the die thereby to permit it to be backed ofi from the work without rotating the work or reversing the threading die.

2. In an automatic multiple spindle screw 4 machine, the combination of a rotary turret carrying a series of rotary work carrying spindles, means for revolving said turret intermittently, means for rotating the work car ing' spindles, means for holding each of t e work carrying s indles stationary `at a predetermined time in t-he revolution of the turret and during the threading operation,l a sliding tool carrier, a threading die carried thereby, means for rotating said threading die continuously in the same direction, means for opening the die thereby to permit it to be backed oit without rotating the work or reversing the threading die, and means for closing the die after the same is backed oit in readiness for another threading operation.

3. In an automatic multiple spindle screw machine, the combination of a rotary turret carrying a series of rotary work carrying spindles, means for revolving saidturret intermittently, means for rotating the work carrying spindles, means for holding each of the work carrying spindles stationary ati a predetermined time in the revolution of the turret and during the threading operation, a sliding tool carrier, a threading die carried thereby, means for rotating said threading die continuously in. the same direction, means for closing and openin the die thereby to permit it to be backe off from the work without rotating the work or reversing the threading die, and means for accelerating the backing olf of the die on the opening thereof.

4. In an automatic multiple spindle screw machine, the combination of a rotary turret carrying a series of rot-ary work carrying spindles, means for revolving said turret in carrying spindles, means for holding each of the work carrying spindles stationary at a predetermined time in the revolution of the turret and during the threading operation, a sliding tool carrier, a shiftable spindle carried by the carrier, a threading die carried by the spindle, means for rotating said threading die continuously in the same direction, means for closing and opening the die thereby to permitl it to be backed 0E from the work without rotating the work or l reversing the threading die, and means for accelerating the backing olf of the die on the opening thereof and comprising a spring mounted on the shiftable diespindle.

5. In an automatic multiple spindle screw machinethe combination of a rotary turret carrying a series of rotary work carrying spindles, means for revolving said turret intermittently, lmeans for rotating the work carrying spindles, means for holding each of the work carrying spindles stationary at a predetermined time in the revolution of the turret and during the threading operation, a sliding tool carrier, a threading die carried thereby and comprising a body and a head shiftable one relatively to the other, means for rotating said threadin die continuously in the same direction, an means for shift ing one of said parts of the die thereby to close and o en the die to permit it to be backed oit rom the Work without rotating the work or reversing the threading die, said die opening means comprising means shiftable with the sliding tool carrier.

6. In an automatic multiple spindle screw machine, the combination-of a rotary turret carrying a series of rotary work carrying spindles, means for revolving said turret intermittently, means for rotatin the work carrying spindles, means for hol ing each of the work carrying spindles stationary at a predetermined time in the revolution of the turret and during the threading operation, a sliding tool carrier, a threading die carried thereby and comprising a body and a head one shiftable relatively to the other, means for rotating said threading die continuously in the same direction, and means for closing and opening the die thereby to permit it to be backed of from the work without rotatr ing the work or reversing the threading die,

` the work carrying spindles stationary at a predetermined time in the revolution of the turret and during thethreading o eration, a sliding tool carrier, a threading ie carried thereby and comprising a body and a head shift-able o-ne relatively to the other, means for rotating said threading die continuously in the same direction, and means for closing and opening the die thereby to permit it to be backed oiie from the work without rotating the work or reversing the threading die,

said die opening means comprising a lever in engagement with ythe die head, a shiftable shaft co-nnected with said lever, an adjust'- able collar on said shaft and means adapted to engage said collar thereby to open the die.

8. In an automatic multiple spmdle screw machine, the combination of a rotary turret 2 carrying a series of rotary work carrying spindles, means for revolving said turret intermittently, means for rotatin the work carryin spindles, means for hol ing each of the wor carrying spindles stationary at a predetermined time in the revolution of the turret and during the threading o eration, a sliding tool carrier, a threading ie carried thereby and comprising a body and a head shiftable one -relatively to the other, means for rotating said threading die continuously in the same direction, and means forclosing and opening the die thereby to permit it to be backed off from the work without rotating the work or reversing the threading die, said die opening means comprising a lever in engagement with the die head, a shiftable shaft connected with said lever, a projection on said shaft, and means adapted Atoengaga said projection thereby to open the die and comprising a pivoted lever and a cam for operating saidlever,

9. In an automatic. multiple spindle screw machine, the combination of a rotary turret carrying a series' of rotary work carrying spindles, mean'sor revolving said turret intermittently, means for rotating thefwork =tinuously gfor closing and opening the die thereby to =permit it to be backed ofi` from the work carrying spindles, means -forv'holding each of the'work carrying spindles stationary at a predetermined time in the revolution of the turret and during the threading operation, a sliding tool carriera threading die carried thereby and comprising a body and a head shiftable one relatively to the other, means for rotating said threading die continuously in the same direction, and means for closing and opening the die thereby to permit it to be backed oit from the Work without rotating the work or reversing the threading die, said die closing means comprising means shiftable with the sliding tool carrier.

10. -In an automatic multi le spindle screw machine, the combination ot a rotary turret carrying a series of rotary work carrying spindles, means for revolving said turret intermittently, means for rotating the work carrying spindles, means for holding each of the`work carrying spindles stationary at .a predetermined time in the revolution of the turret and during the threading operation, a sliding tool carrier, a threading die carried thereby and comprising a body andy a head shitable one relatively to the other,

means for rotating said threading die conin the same direction, and means without rotating the work or reversing the Athreading die, said die closing means comprising a stop, a pivoted arm shii'table with the tool carrler and carrying a stop adapted- `to engage said first stop'vand thereby shift the die body.

11. In an automatic multi le spindle screw machine, the combination o a rotary turret vcarrying a series of rotary work carrying spindles, means for revolving said turret intermittently, means for rotating the work carrying s indles, means for holding each of the-wor carrying spindles stationary at a predetermined time in the revolution ,of

the turret and` during the threadin operation, a sliding tool carrier, a threa ing die carried thereby and comprising a body and a head shiftable one relatively to the other,

means for rotating said threading die continuously in the same direction', and means for closing and opening the die thereby to permit 'it to be backed oii from the work without rotating the work or reversing the threading die, said disclosing means comf prising a sto and a pivoted arm shiftable with the too carrier andl carrying a'stop adapted to engage said first sto and thereby shift the ie bod one or oth of said stops being, adjustab e.

12. ln an automatic multiple spindle'screw. I machine, the combination of a rotary turret.

carrying a'fseries `of rotary work carrying,"

spindles, means `fr. revolving said turret intermittently, means'or rotating thework threading die, said die opening means comprising means carried by the sliding tool carrier and said die closing means also comprising means carried by the sliding tool carrier.

13. In an automatic multiple spindle screw machine, the combination of a rotary turret carrying a series of rotary Work carrying spindles, means for revolving said turret intermittently, means for rotating the Work carrying s indles, means for holding each vof the Wor carrying spindles stationary at a predetermined time 1n the revolution of the turret and during the threading operation, a sliding tool carrier, a threading die carried thereby and comprising a body and a head shiftable lone relatively to the other, means for rotating said threading die continuously in the same direction, and means for closing and opening the die thereby to permit it to be backed off from the Work Without rotating the Work or reversing the threading die, said die opening means comprising means carried by the sliding tool carrier and said die closing means also comprising means carried by the sliding tool carrier, one operative on the head of the die and the other on the body thereof.y

14. In an automatic multi le spindle screw machine, the combination ci) a rotary turret carrying a series of rotary Work carrying spindles, means for revolving said turret intermittently, means for rotating the Work carrying spindles, means forlholding each of the Work carrying spindles stationary at a predeterminedtime in the revolution of the turret and during the threading operation, a sliding tool carrier, a sliding spin le carried by said tool carrier, a threading die carried by said tool carrier and comprising a body and a head shiftable one relatively to the other, means for rotating said threading die continuousl in the same direction, and means for closing and opening the die thereby to permit it to'be backed off from the Work without rotating the Work or reversing the threading die, said die opening means comprising means carried by the sliding tool carrler and said die-closing means comprising means carried by the sliding tool carrier and operative on the threading die spindle.

15. In an automatic multiple spindle screw machine, theA combination of a rotary turret carrying a series of rotary Work carrying spindles, means for revolving said turret 1ntermittently, means for rotating the work carrying spindles, means for holding each of the Work carrying spindles stationary at a predetermined 'time in the revolution of the turret and during the threading operation, a sliding tool carrier, a sliding spindle carried by the tool carrier, a threading die carried by said tool carrier and comprising a body and a head shiftable one relatively to the other, means for rotating said threading die-continuously in the same direction, and means for closingand opening the die thereby to permit it to be backed off from the work without rotating the work or reversing the threading die, said die opening means comprising a lever in engagement with the die head, a shiftable shaft connected with said lever and movable with the sliding tool carrier, a collar' on said shaft and means adapted to engage said collar thereby to open the die, and said die closing means comprising an arm carried by the sliding tool carrier and coperating With the threading die spindle, a stop carried thereby, and a stop adapted to be engaged by said last stop thereby to close the die.

16. In an automatic multiple spindle screw machine, the combination of a rotary turret carrying a series of rotary Work carrying spindles, means for revolving said turret intermittently, means for rotating the Work carrying spindles, means for holding each of the work carrying spindles stationary at a predetermined time in the revolution of the turret and during the threading operation, a sliding tool carrier, a sliding spindle carried by the tool carrier, a threading die carried thereby and comprising a body and a head shii'table one relatively to the other, means for rotating said threading die continuously inthe same-direction, and means for closing and opening .the die thereby to permit it to be backed off from the Work Without rotating the Work or reversing the threading die, said die opening means comprising a lever in engagement With the die head, a shiftable shaft connected with said lever and movable with the sliding tool carrier, a collar on said shaft, and means adapted to engage said collar thereby to open the die and comprising a pivoted lever and a cam for shifting said lever, and said die closing means comprising an arm carried by the sliding .tool carrier and coperating With the threading die spindle, a stop carried thereby, and a stop adapted to be engaged by said last stop thereby to close the die. 17. In an automatic multiple spindle screw machine, the combination of a rotary turret carrying a series of rotary Work carrying spindles, means for revolving said turret intermittently, means for rotating the work carrying spindles, means for holding each of the Work carrying spindles stationary at a predetermined time in the rev'olution of the turret and during the threading operation,

threading die, said die opening means comprising a lever in'engagement with the die head, a shiftable shaft connected With said lever and movable With the sliding tool carrier, a collar on said shaft and means adapted to engage said collar thereby to open the die, and said die closing means comprising an arm carried by the sliding tool carrier and coperating with the threading die spindle, a stop carried thereby and a stop adapted to be engaged by said last stop thereby to close the die, and a spring carried by the threading die spindle for accelerating the backing oif of the die on the opening thereof.

18. In an automatic multiple spindle screw machine, the combination of a rotary turret carrying a series of rotary Work carrying spindles, means for revolving said turret intermittently, means for rotating the work carrying spindles, means for holding each of the Work carrying spindles stationary at a predetermined time in the revolution of the turret and during the threading operation, a sliding tool carrier, a sliding spindle carried by the tool carrier, a threadlng die carried thereby and comprising a body and a head shiftable one relatively to the other, means for rotating said threading die continuously in the same direction, means for closing and opening the die thereby to permit it to be backed ofi from the Work Without rotating the Work or reversing the threading die, said die opening means comprlsmg a lever in engagement with the die head, a shiftable shaft connected with said lever and movable with the sliding tool carrier, a collar on said shaft, and means adapted to engage said collar thereby to open the die and comprising a pivoted lever and a cam for shifting said lever, said die closing means comprisln an arm carried by the sliding tool carrler and coperating With thel threading die spindle, a stop carried.

thereby and a stop adapted to be engaged by said last stop therebyto close the die, and a spring carried by the threading die spindle for accelerating the backing off of the die on the opening thereof.

19. In an automatic multiple spindle screw machine, the combination of a rotary turretcarr ing aseries of rotary Work carrylng spin les, means for revolving the tura sliding tool carrier, a threadin thereby to ret intermittently, means for rotating each of the Work carrying spindles in the same direction, means for holdin each of the Work carrying spindles statlonary during the threading operation, a sliding tool carrier carrying a plurality of tools one comprising an openable and closable threading die, means for rotating the threading die continuously in one direction, and means for opening and closing thedie thereby to enable it to be backed oi from the Work Without rotating the Work or reversing the threading die.

20. In an automatic multiple' spindle screw machine, the combination of a rotary turret carrying a series of rotary Work car- 4rying spindles, means for revolving said turret intermittently, means for rotating the Work carrying spindles, means for holding each of Vthe work carrying spindles stationary at a predetermined time in the revolution of the turret and during the threading operation and comprising a clutch carried by each of said Work spindles and an,actuator for successively engaging each of said clutches thereby to operate it,

die carried thereby, means for rotating said thread- .ing die continuously in the same direction,

and means for closing and opening the die ermit it to be backed off from the Work Without rotating the Work or reversing the threading die.

21. In an automatic 'multiple spindle screw machine, the combination of a rotary turret carrying a series of rotary Work carrying spindles, means for revolving the turret intermittently, means for rotating each of the Work carrying spindles in the same direction, a clutch carried by each of the Work spindles, means for operating each of the clutches at a predetermined time thereby to stop the rotation of its spindle, means for vholding the spindle stationary during the threading operation, a sliding Ytool carrier carrying a plurality of tools, one comprising an openable and closable threadin die comprising a head and a body shiftab e one relatively to the other, a sliding spindle carrying said die, means for rotating the threading die continuously in one direction, means for opening and closing the die thereby to enable it to be backed off from the Work without rotating the Work or reversing the threading die, said die opening means comprising cam operated means and said die closing means comprising stop operated means, and means carried by the spindle for accelerating the backing ol of the die on the opening thereof. L

22. In a machine of the class described, the combination of a Work carrying spindle supported for rotary movement in one direction, means for rotating said spindle means for stopping and holding the spindle sta- 15 ary during the threading operation,

tionary during the threading operation, a shiftable and rotatable threading die supported in position to operate on the Work carried by the Work carrying spindle, means for rotating said threading die continuously in the same direction, and means for opening and closing the die thereby to permit it to be backed 0H from the Work Without rotating the Work or reversing the threading die.

23. In a machine of the class described, the combination of a Work carrying spindle supported for rotary movement in one direction, means for rotating said spindle, means for stopping and holding the spindle staofrable and rotatable threading die supported in position to operate on the Work carried by the Work vcarrying spindle, means for rotating-said threading die ,continuously in the same direction, means for opening and closing the die thereby to permit it to be backed 0E from the Work Without rotating the Work or reversing the threading die, means for backing oif the die from the Work, and means Jfor accelerating durin ing oi' movement the backing o of the die.

EDWIN C.HENN. Witnesses:

A. H. HOPKINS, PAUL E. RYAN.

such back! 

